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Printable magnesium ion quasi-solid-state asymmetric supercapacitors for flexible solar-charging integrated units

Author

Listed:
  • Zhengnan Tian

    (Soochow University)

  • Xiaoling Tong

    (Soochow University)

  • Guan Sheng

    (King Abdullah University of Science and Technology)

  • Yuanlong Shao

    (King Abdullah University of Science and Technology)

  • Lianghao Yu

    (Soochow University)

  • Vincent Tung

    (King Abdullah University of Science and Technology)

  • Jingyu Sun

    (Soochow University
    Beijing Graphene Institute (BGI))

  • Richard B. Kaner

    (University of California, Los Angeles (UCLA))

  • Zhongfan Liu

    (Soochow University
    Beijing Graphene Institute (BGI)
    Peking University)

Abstract

Wearable and portable self-powered units have stimulated considerable attention in both the scientific and technological realms. However, their innovative development is still limited by inefficient bulky connections between functional modules, incompatible energy storage systems with poor cycling stability, and real safety concerns. Herein, we demonstrate a flexible solar-charging integrated unit based on the design of printed magnesium ion aqueous asymmetric supercapacitors. This power unit exhibits excellent mechanical robustness, high photo-charging cycling stability (98.7% capacitance retention after 100 cycles), excellent overall energy conversion and storage efficiency (ηoverall = 17.57%), and outstanding input current tolerance. In addition, the Mg ion quasi-solid-state asymmetric supercapacitors show high energy density up to 13.1 mWh cm−3 via pseudocapacitive ion storage as investigated by an operando X-ray diffraction technique. The findings pave a practical route toward the design of future self-powered systems affording favorable safety, long life, and high energy.

Suggested Citation

  • Zhengnan Tian & Xiaoling Tong & Guan Sheng & Yuanlong Shao & Lianghao Yu & Vincent Tung & Jingyu Sun & Richard B. Kaner & Zhongfan Liu, 2019. "Printable magnesium ion quasi-solid-state asymmetric supercapacitors for flexible solar-charging integrated units," Nature Communications, Nature, vol. 10(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12900-4
    DOI: 10.1038/s41467-019-12900-4
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